text: A quarter of all organic material that exits the photic zone makes it to the seafloor without being remineralised and 90% of that remaining material is remineralised in sediments itself. Once in the sediment, organic remineralisation may occur through a variety of reactions. The following reactions are the primary ways in which organic matter is remineralised, in them general organic matter (OM) is often represented by the shorthand: .